
My entire calendar was deleted (I lost 3 years of important events) on my iPhone 6. This happened when I took it to the Genius Bar and they synched / merged my calendar to iCloud KNOWING MY PHONE WAS NOT BACKED UP! Is there anyway to retrieve the data? Again, the data was only saved to my phone. Having that said, I just can't comprehend how 3 years of events could be just deleted permanently by turning on iCloud for calendars. Please help! This information is vital to me!!!
Obviously, when merged calendars to iCloud, the calendars from iPhone were erased by those calendars synced from iCloud server. So the question here is how to recover iPhone lost calendars when merged with iCloud? I guess most people may have the same situation where you do nothing, but those calendars are just gone. Actually, you don't have to panic, for we have methods to help you recover your iPhone lost calendars when merged with iCloud. Here we go.
In order to get back your iPhone lost calendars, you need the help from a third party software, named as iFonebox. As is known that iFonebox is a professional iOS data recovery which can not only recover deleted or lost data like contacts, calendars, messages, notes, etc, from iPhone, iPad and iPod Touch, but extract and restore lost data like photos form iTunes or iCloud backup selectively without erasing or wiping any data from your iPhone. Its three main features are: recover lost data from iOS device directly, restore data from iTunes backup selectively, retrieve data from iCloud backup. Amazing.
Let's first go to download and install iFonebox: Windows version and Mac version. You can pick out one version to install according to your computer model.
How to recover iPhone lost calendar when merged with iCloud?
After installation of iFonebox, you can refer to the detailed steps listed as follows. Take iFonebox for Windows version as example.
--Launch iFonebox. Choose "Recover from iOS Device" mode. Please connect your iPhone to the computer so as to scan and analyze lost calendars from it. Click "Start" button to begin the process.

--Scan calendars from iPhone 6. Click Calendars item to start the scanning process.

--Preview and select lost calendars to recover. After scanning, your lost calendars, including the appointments and events, all will be shown here. Just pick out those lost calendars you need and then, click Recover to PC button to get back iPhone lost calendars.

Notes: if you have an iTunes or iCloud backup for your lost calendars, you can also choose "Recover from iTunes Backup" or "Recover from iCloud Backup" mode to recover your iPhone lost calendars when merged with iCloud.